This is not the elevator companys responsibility. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. Dont troubleshoot unless you can keep your shoe/boot soles dry. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. (C) Duplex Receptacle. The reason the NEC CMP 12 added these requirements, as shown in the panel statements, directly relates to the concern that elevator controllers can be installed in locations where the available fault current can be high and the inspector may not be able to clearly determine the SCCR of the elevator controller unless it is marked on the equipment. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. These 29 CFR 1910.146 (c) (8) requirements are: All rights reserved. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. This may be countered by providing good machine-room ventilation. A further requirement concerns elevator-car air-conditioning and heating. Therefore, there will be two signals to the elevator control panel related to smoke detectors: one from the designated floor smoke detector and another combined signal from the smoke detectors at the other lobby landings and in the equipment room. PDF Compliance with the 2017 NEC for Elevator Controllers from components that are not otherwise guarded. He participates in IEEE (Senior Member) with Industrial and Commercial Power Systems, NEMA (member of the Codes & Standards Committee), NFPA (committee member for NEC CMP-13 and NFPA 79), UL (508/60947 and 508A) and IAEI activities. After reading this article, you should have learned about: The meanings of definitions for control room and control space versus machine room The purpose and specifications for working spaces Insulation types and minimum sizes of conductors Requirements for feeder and branch-circuit conductors Feeder demand factors for ele-vators. Article 511 provides the requirements for commercial garages areas used for the storage or repair of self-propelled vehicles that use combustibles (liquid or gas) for power. Section 620.37 re-emphasizes that only wiring used in connection with the elevator is permitted within the hoistway, machine room, control room/machinery space or control space. 2m9 `K]f*F gaR IAEI News Magazine. This position paper is written to provide guidance to members whose employees are engaged in elevator-industry work that might expose them to arc-flash hazards, and to assist members in complying with applicable OSHA and National Fire Protection Association (NFPA) standards. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. No provision is to be made to automatically restore power. All equipment in a machine room-less design is installed within the elevator shaft or exterior compartment near the elevator shaft, including the elevator controller and the elevator disconnecting means. endstream endobj 954 0 obj <. PDF C.1 General Requirements for All Elevator Installations GFCIs in elevator pits During an inspection of the elevators in a commercial building, the state inspector failed us for using a GFCI-type circuit breaker to protect a receptacle in the elevator pit. You can email the site owner to let them know you were blocked. The main impetus for the creation of the NEC in the closing years of the 19th century was the collective anguish experienced by insurance underwriters who were losing vast amounts of money due to liability and physical damage claims resulting from Edisons electrification of, first, Lower Manhattan and then the world. All rights reserved. !>x=yy Bvv8?~e PK ! In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. Elevator Pit Requirements | Mike Holt's Forum This strategy works to improve the flexibility of the traveling cable, but it is contrary to a general NEC rule concerning the paralleling of conductors, which is generally done in very large sizes to avoid unwieldy wire pulls and terminations. Elevator travel is far safer than an automobile trip, and the chance of experiencing disaster is on the order of being struck by lightning in ones own backyard. Recommendations for EazyLift Elevators, Stairlifts, Wheelchair Lifts Use the below learning-reinforcement questions to study for the Continuing Education Assessment Exam available online at www.elevatorbooks.com or on page 81 of this issue. Which equipment requires a separate branch circuit in the elevator car? Is lighting required to be GFCI protected in the machine room? Where is the lighting switch to be located in the machine room? What is the maximum raceway conductor fill in an elevator hoistway? How many disconnecting means are required for an elevator power supply? Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. The surest means of avoiding an arc-flash hazard is to lockout and tagout the electrical service to a controller. As for height, the working space must extend from the grade, floor or platform to 6-1/2 ft. or the height of the equipment, whichever is greater. Follow the manufacturers instructions and precautions. Hydraulic elevator installations are typically supplied from the main switchboard and have an elevator fused switch or circuit breaker in the machine room that serves as the elevator disconnect. The basic rule for conductor fill of a metal wireway, as given in Article 376, is that the sum of the cross-sectional areas of all contained conductors at a cross section of a wireway is not to exceed 20% of the interior cross-sectional area of the wireway. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. If a smoke detector goes into alarm, it signals the elevator to go into Fire Recall Function, at which point the controller directs the elevator cab to travel to its pre-programmed designated landing, open its doors, and remain stopped there until the alarm clears. NEC 2011 Article 620.21(2)(b) states that hard-service cords and junior hard-service cords that conform to the requirements of Article 400 (Table 400.4) are permitted as flexible connections between the fixed wiring on the car and devices on the car doors or gates. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. The pump sends hydraulic fluid from the reservoir to the cylinder, buried deep below the elevator shaft. Specifically, Section 725.43 provides that overcurrent protection for conductors 14 AWG and larger is to be provided in accordance with the conductor ampacity without applying ampacity adjustment and correction factors. NEC Article 0: Elevator art by David Herres Continued. Part of the reason that elevator usage is extraordinarily safe is that construction and maintenance are regulated by the wonderfully robust ASME A17.1 2007/CSA B44-07 Safety Code for Elevators and Escalators, which contains overall construction and maintenance requirements everything from seismic mandates to machine-room lighting. Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. When you're designing an electrical system for a building, don't let elevator requirements bring you down. The most complex of these is the elevator. This room is to be secured against unauthorized access (kept locked). Use Underwriters Laboratories or Canadian Standards Association-labeled scopes tested for 1,000 V. Lockout/tagout: When troubleshooting is complete and further work can be accomplished without the equipment being energized, follow the lockout/tagout procedures in Section 7 of the. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. This is somewhat broader than A17.1-2007/B44-07. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. +90 (216) 348 4876, India Office Guarding: Where possible, install temporary guarding to protect from inadvertent contact. The architect has a choice of either traction or hydraulic elevators. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. For example, it is stated that the cross-sectional area of the individual conductors in a wireway are not to exceed 50% of the interior cross-sectional area of the wireway. For some manufacturers, such as Eaton, testing has been completed to determine the selective coordination ability of current-limiting BussmannTM series fuses with upstream Eaton circuit breakers. This, however, can result in a dramatic increase in cost, space availability (lack thereof), and reduced efficiency. It is important to note, that these selective coordination tables can indicate a lack of selective coordination at a given fault current for circuit breakers that do not show overlap on the time-current curves of the circuit breakers. Feeder and branch-circuit conductors are required to have specified ampacities: Feeder conductors of less ampacity are permitted for group installations and quite common in elevator work. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. You'll need to run telephone cables to the equipment room control panel, but the elevator supplier will take care of getting the cables to the elevator cab. Many NEC articles address voltage limitations, and Article 620 is no exception. Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. (ASME has a separate document, A18.1-2008 Safety Standard for Platform Lifts and Stairway Lifts). (B) Lighting Switch. Moreover, it is necessary to consider future worker safety for an indefinite period. Regardless of the number of elevators, only one smoke detector is required at each floor lobby, but it must be located within 21 ft of every elevator door. Thus, the traveling cable must be supported by a steel supporting member. Many undertake trips in these devices two or more times daily in full confidence that they will survive an uneventful experience with a minute chance of disaster or even inconvenience. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. Reinforcing NEC 110.3(B) and NEC 110.10 to require the elevator controller marked SCCR to be equal to or greater than the calculated and Doors must open in the direction of travel and be equipped with panic bars, pressure plates or other devices that are normally latched but open under simple pressure. You must run a separate insulated grounding conductor with the feeder conductors from the electrical source to the elevator controller. Granle is a licensed professional engineer with Sebesta Blomberg & Associates, Rochester, Minn. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/, ABCs Construction Backlog Indicator Down to Start 2023, The Most Popular Code Quizzes of the Week from 2021, The 10 Most Popular Photo Galleries of 2021, Whats Wrong Here? Compliance with the 2017 NEC for Elevator Controllers Mobile, AL 36606 USA When you consider that an elevator is an enclosed room with one or more doors that people voluntarily enter so they may travel hundreds of feet up or down, several observations are in order. Similarly, the integrity of the traveling cable is emphasized. Motor controllers are permitted outside the spaces specified above. of the sprinkler heads. Get more of Elevator World. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. The basic requirement is for minimum clear distances of various depths for equipment operating at 600 V or less, nominal, depending upon voltage to ground and lateral distance to insulated or grounded surfaces or exposed live parts (not an issue in elevator machine rooms). Depending on your local codes, you can do this by installing heat or smoke detectors within 24 in. To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. ASME A17.1 . Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. Cross-sectional areas of conduits are given in Chapter 9, Table 4. These selective coordination tables for current-limiting fuses show the minimum amp ratio required between a pair of fuses of a given type(s) to achieve selective coordination. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. However, this can vary depending on building conditions and exterior grade. The same figure applies to nonmetallic wireways. Selective coordination is also required for multiple elevators per NEC 620.62. . 836 Troy Schenectady Road ; Latham, NY 12110 . Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. They are to be part of listed equipment, a driving machine or a driving-machine brake. Traction elevators raise and lower the elevator cab with cables, a pulley system, and counter weights powered by a motor at the main drive wheel. Other building loads, such as power and lighting, may function as the energy absorbing means, provided these loads are automatically connected to the emergency or standby power system operating the elevators and large enough to absorb the regenerative power. My reasoning comes from 620.24 (A) and (C). NEC Article 620: Elevators, Part 2 - Elevator World, Inc. Hydraulic elevator pit | Electrician Talk You'll be responsible for specifying the items related to the fire alarm and some controls, as well as supplying lighting and power to the equipment room and elevator pit. 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education . The traveling cable, of necessity, is exempted. In order to comply, the electrical system designer must determine the maximum available fault current at the elevator disconnecting means and assure the elevator disconnecting means overcurrent protective device will clear any overcurrent condition, up to the maximum available fault current, before any upstream overcurrent devices will operate. The conduit alone can't act as the grounding means. Working spaces for electrical equipment that may have to be examined, adjusted, serviced or maintained is required in all occupancies in an earlier NEC section, 110.26(A). A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. Guidance in determining whether elevator pits meet the definition of The Uniform Building Code requires two-way communications between the central command center and the elevators, each elevator lobby, emergency power rooms, and by entries into enclosed stairways (Section 403.5.3). With the new elevator controller requirements, more attention will be focused on the elevator system. This may include wiring for signals, communication with the car, lighting, heating, air-conditioning and ventilation of the car or hoistway for fire-detecting systems and pit sump pumps. PK ! The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. Marking the available short-circuit (fault) current on the controller by the equipment installer. It provides that where more than one driving-machine disconnecting means is supplied by a single feeder, the overcurrent protective devices in each disconnecting means are to be selectively coordinated with any other supply side overcurrent protective devices. In hoistways not longer than 6 ft., these additional wiring methods are permitted: A sump or oil-recovery pump located in the pit is permitted to be cord connected. Such vehicles include, but are not . Section 620.43, Location of and Protection for Cables, provides that traveling cable supports are to be located so as to reduce the possibility of damage due to the cables coming in contact with the hoistway construction or equipment in the hoistway to a minimum. They are to be located so as to be protected from physical damage, are to be of a flame-retardant type, and must be part of listed equipment, a driving machine or a driving-machine brake. Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. Instruments: Use category III multimeters and be familiar with their use and limitations. Besides the initial determination requirement of paragraph (c) (1), the "host" employer must comply with the five (5) requirements of paragraph (c) (8) when engaging another employer (contractor) who will have employees in permit spaces under the control of the host employer. You need to Subscribe to continuing reading. Selective coordination is also required for multiple elevators per NEC 620.62. 23.254.250.15 Elevator Pit FC Requirements CE017 - 1 - AppendicesABC - Code The condition is that all conductors must be insulated for the maximum voltage applied to any conductor within the cables or raceway system, and all live parts of the equipment must be insulated from ground for this maximum voltage. PDF Elevator Acceptance Inspections - Tennessee Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. proved for elevator locations - car, hoistway, pit and a-chine roo equireents in Article odify the articles in Chap - ter For eaple, it is stated that the cross-sectional area The sum of the cross-sectional area of the individual conductors in raceways is not to exceed 40% of the interior cross-sectional area of the raceway, except as permitted for wireways. Requirements for commercial garages per the National Electrical Code. You are seeing this message for one of three reasons: You have reached your limit of free content. Society of Mechanical Engineers. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. But by understanding how these items fit together and what purpose they serve, you can have a successful project. The electrical system designer calculates the maximum available fault current at the elevator controller. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. Conductors supplying more than one motor, motor controller or power transformer are to have an ampacity not less than the sum of the nameplate current ratings of the equipment plus all other connected loads. Your Quick and Easy Elevator Code Checklist | Kings III Machine room-less elevator installations incorporate the elevator controller and often the primary disconnecting means in a convenient package that is located within the elevator shaft. Sign up for our free e-newsletter. Where multiple driving machines are connected to a single elevator, there is to be one disconnecting means to disconnect the motor(s) and control-valve-operating magnets. APPENDIX A 2.2. A surge of immigration to the U.S., the end of slavery and, on both sides of the Atlantic Ocean, a burgeoning industrial revolution ignited an acceleration in new building. He is saying that each pit requires a separate circuit, in other words "dedicated". Sign up for our free e-newsletter. They are differentiated from other similar structures by the fact that they are not attached to the outside perimeter or surface of the walls, ceiling or floor of the hoistway. Conductors supplying a single motor are to have an ampacity not less than the percentage of motor nameplate current determined from Section 430.22(A) and (E). In fact, an entire elevator system for a project is most often designed and specified by the architect who has little understanding of the electrical distribution system. The many codes and guidelines that regulate the electrical design of an elevator can seem overwhelming, and dealing with the electrical inspector, elevator inspector, and Fire Marshal can be even more intimidating. Furthermore, at least one 125-V, single-phase, 15- or 20-amp duplex receptacle is to be provided in each machine room or similar location. 953 0 obj <> endobj The demand factor ranges from 1.00 for one elevator on a single feeder to 0.72 for 10 or more elevators on a single feeder. Main feeders that supply elevator power must be kept outside the hoistway unless one of the following applies: Feeders for elevators are permitted within an existing hoistway (provided they are not spliced within the hoistway) by special permission of the AHJ. This website is using a security service to protect itself from online attacks. PDF Elevator Safety Program - Technical Clarification +;-mka|7! From the website: Mohawk Lifts offers car lifts and auto lifts for purchase, including 2 post lifts, 4 post lifts, storage lifts, heavy duty mobile column lifts, parallelogram lifts, and other specialty items. In an elevator machine room, where space may be limited in the first place, the working-space mandate must be factored in very early in the design process lest an unthinkable amount of rework be necessary. On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. Traditional wiring methods and materials come into play, as always, but it is necessary to rethink their deployment. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location David Herres David Herres holds a New Hampshire Master Electrician's license and has worked as an electrician in the northern part of that state for many years. The cover shall be secured and level with the pit floor. The code is not concerned with the efficiency or sophistication of equipment that it covers, except insofar as safety (in terms of human injury and property damage) is concerned. If elevators are supplied by the emergency, legally required standby or critical operation power systems, then selective coordination is required per the 2017 NEC in 700.32, 701.27 or 708.54. This may be countered by providing good machine-room ventilation. ) > word/_rels/document.xml.rels ( N0HC;qRN/W$#{1EM]ZY|vj5h),-g!`./V/KKFY4D#la&V#=$Q7|l/d#hS 7+IDZ!J 6KucD^s`+>=(3E NEC articles generally adhere to a template, which greatly aids in navigating and quickly locating mandates as needed for project design or, on an installation level, in the field. The idea is quite simple. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. above the pit floor, shall: Be weatherproof (NEMA 4).

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